[SPARK-25673][BUILD] Remove Travis CI which enables Java lint check #22667
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What changes were proposed in this pull request?
#12980 added Travis CI file mainly for linter because we disabled Java lint check in Jenkins.
It's enabled as of #21399 and now SBT runs it. Looks we can now remove the file added before.
How was this patch tested?
N/A
Closes #22665